A steel plate with high axial bearing capacity and excellent formability for tanks and its manufacturing method

Abstract

Disclosed is a steel plate with axial bearing capacity and excellent formability used for cans and a manufacturing method thereof. The steel plate comprises the following components, by weight: 0.020%-0.080% of C, no more than 0.030% of Si, 0.20%-1.00% of Mn, no more than 0.020% of P, 0.0020%-0.0080% of N, and Al, with the balance being Fe and unavoidable impurities, wherein 10<=Al / N<=20. High yield strength and a rising value of the yield strength after baking can be obtained by controlling hot rolling, cold rolling, continuous annealing temperature and other processes. The invention aims atthe material with processing requirements of axial bearing capacity after can making baking, and the steel plate with axial bearing capacity and excellent formability is obtained according to component and process design. The yield strength of the steel plate is greater than 300 MPa, the strain hardening index (n value) is greater than 0.15, the rising value of the yield strength after baking of the steel plate is no less than 30 MPa, and the axial bearing capacity obtained after the can making baking is no less than 218 kg. The problem that the axial bearing capacity of the steel plate is insufficient after the can making baking is solved.

Description

technical field [0001] The invention relates to a cold-rolled steel plate and a manufacturing method thereof, in particular to a steel plate with high axial bearing capacity and excellent formability for cans and a manufacturing method thereof. Background technique [0002] Due to its good processability, cold-rolled steel sheets are widely used in home appliances and packaging. Among them, packaging materials are mainly used in can bodies and can lids. Cans are divided into three-piece cans and two-piece cans according to the forming method. Most of them are used in food, chemical industry In the packaging industry, more and more two-piece cans are used for packaging materials in recent years, and it has become a development trend to punch two-piece cans with one-time cold rolling. The primary cold-rolled material is different from the secondary cold-rolled material (the ) is defined as cold-rolled tin-plated material (chrome-plated material) made of cold-rolled annealed an...

AI Technical Summary

Problems solved by technology

[0004] The production of steel plates used to make two-piece cans such as food cans and beverage cans in the prior art requires good material processability. The conventional steel plate manufacturing process adopts methods such as continuous annealing of low-carbon steel, aluminum-killed steel, etc., but because the conventional process pays attention to deep material The high thinning of the drawing affects the improvement of the strength. It is difficult for the conventional process to solve the contradiction between the material strength and the drawability. Due to the inherent shortcomings of the conventional process, the yield strength of the material after tin plating is low, and the can The increase in the yield strength of the material is too small, resulting in insufficient axial bearing capacity of the tank

Due to the limitations of conventional low-carbon aluminum-killed steel and annealing process, the produced materials cannot be used for processing requirements such as higher axial bearing capacity and deep drawing; other materials such as ultra-low carbon high-strength IF steel have lower strength and ductility Good, but because there is basically no bake hardenability, the axial bearing capacity of the tank basically depends on the original strength in terms of material properties, which will inevitably increase the original strength of the steel plate excessively, which will bring difficulties to the manufacture of thin steel plates and stamping and stretching, and the alloy Too much addition and thin thickness make the manufacturing cost higher

There are also some materials such as processing and strengthening, because it is difficult to take into account the strength and ductility of the material, and it is also difficult to make a tank body that meets the requirements such as axial bearing capacity.

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